Telephonic apparatus.



P. M. OLIVER.

TELEPHONIO APPARATUS.

APPLIOATION IILE'D JUNE 10, 1909.

951,695. A Patented Mar. 8, 1910.

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UNITED S TES Parana. OFFICE.

PEDRO MARCEB OLIVER, OI BARCELONA, SPAIN.

. TELEPHONIC. APPARATUS.

.. in 'lelephonic Apparatus; and I do hereby declare the following to bc-a full, clear, and exact deseription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in telephonic receiving apparatus and consists in the combination with the receiving apparatus of an annular coil secured to the vibratory plate, and a magnet having one of the poles located within the coil, without making contact therewith, while the other pole is out of the coil, without contacting therewith and wholly or partially surrounding said coil.

In order that this invention maybe clearly understood, I have represented it in the ac companying drawings, in which- Figure l is a sectional view of my improved telephonic receiving apparatus and Fig. 2, is a sectional view of a modification thereof.

In the receiving apparatus shown in Fig. 1, the vibratory plate or diaphragm b is fitted with an annular coil a, suitably secured to the face of said plate opposite to the outer casing c: an electromagnet c has one of'its poles e within Jthe coil a and the other pole in the form of a U shaped bar or bridge stands outside the coil and terminates at the level of same. The wires f g of the annular coil are electrically connected to the telephonic line and the wire f g of the electromagnet coil are connected to an independent circuit. The outer pole of the magnet e is fitted with a ring h of magnetic material surrounding the annular coil a. I

The arrangement of parts above referred to has the'ef'fect of largely amplifying the vibrations of the plate. the results thus obtained being most eflieient and higher than those now available in similar apparatus. This will be apparent when it is remembered that any strength of magnetic field desired may be produced between the poles c and h by suitably regulating the current passing through the wires 7 and 9 so that the variations in the field of'the coil a due to Specification of Letters Patent.

Application filed June 10, 1909. Serial No. 501,812.

Patented Mal 8, 1910.

the currents received from the distant sta tion, can be utilized to a high degree of efficiency in reproducing speech. Furthermore, since these currents are alternating in character each current received Wlll cause an attractive and a repulsive force to be exerted on the diaphragm b, so that the movementsof said diaphragm will be sharp and clear and this effect is also capable of being magnified within limits by increasing the turns of Wire in said coil a.

The acoustical elfects of the receiving apparatus Will increase by arranging the parts asshown in Fig. 2. In this form of apparatus the pole c of the magnet -e bears a heel c in close contact vith the central part. of the vibratory plates}; the opposite part of this plate is in contact with a spring (Z secured to the outer casing 0, so that the vibratory plate 6 is caught at the center and remains between the spring and heel. The heel 6 may be dispensed With, in which case the central part of the plate Z) is only in contact with the spring d.

A great advantage of the arrangement above described is that it greatly neutralizes or diminishes the self vibrations of the plate.

The receiving apparatus described may be also employed as a transmitting apparatus.

Having thus described the nature of my invention and in what manner the same is to be performed, I declare that what I claim and desire to secure by Letters Patent, is:

1. In a telephonic receiving apparatus, the combination of an annular coil secured to the vibrator plate, and a magnet having one pole provided with a heel within the annular coil and adapted to contact with the vibratory plate, while the other pole terminates outside the annular coil; substantially as described.

2. In a telephonic receiving apparatus, the combination of an annular coil secured to the vibratory plate, a magnet having one pole provided with a heel Within the annular coil contacting with said plate, and the other pole terminating outside of the annular coil, and a ring attached to said last named pole and located outside the annular coil; substantially as described.

3. In a telephonic receiving apparatus, the combination of an annular coil secured to the vibratory plate, a magnet having one pole within the annular coil and contacting with saidplate, and the other pole terminating outside the annular coil, at substantially the same level, and a ring attached to said last named pole and surrounding the annular coil, substantially as described.

4. In the telephonic receiving apparatus, the combination of an annular coil secured to the vibratory plate, a magnet having one pole Within the annular coil, rovided With a heel contacting with said p ate While the other pole surrounds the said coil and a spring in close contact with the vlbratory plate opposite said heel; substantially as described.

5. In the telephonic receiving apparatus,

the combination of an annular coil secured to the vibratory plate, a magnet having one pole within the annular coil, while the other pole or an expanded part thereof surrounds the annular coil, a heel at the end of the inner pole of the magnet, in contact with the center of the vibratory plate, and a spring roun ing said coil; a piece 6 constituting the other pole secured at the center of said U-shaped piece and projectin into said coil; a second coil surrounding sai iece e; a casing C, and clamping means or said plate between said casing and said U-shaped piece, substantially as described. I

In testimony whereof, I affix my signature, in presence of two Witnesses.

PEDRO" MARCER OLIVER.

Vitnesses GONSTANTINO LOPER C11), HENRY MARTINEZP' 

